& @Lock keys

  You may use the following keys when setting locks.  For information 
  about a particular type of key, type 'help @lock <keytype>'.
 
  Key Type    Form in @Lock Command
  ----------  ------------------------------
  Normal      <object>
  Is          =<object>
  Carry       +<object>
  Ownership   $<object>
  Indirect    @<object>
  Attribute   <attribute>:<wildcard-pattern>
              +<attribute>:<wildcard-pattern>
              =<attribute>:<wildcard-pattern>
  Evaluation  <attribute>/<value>
  Compound    <key> & <key>
              <key> | <key>
              !<key>
              ( <key> )
